Portion of an off-highway truck



FIG. 1 is a right front perspective view of a portion of an off-highway truck showing our new design in use condition;

FIG. 2 is a left front perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof; and,

FIG. 5 is a front view thereof.

The top view, the bottom view, and the rear view do not form part of the claimed design and therefore are not disclosed.

The elements depicted in dashed lines form no part of the ornamental design. 

The ornamental design for a portion of an off-highway truck, as shown and described. 